Where Did Each Column Go?

A ColumnTransformer sends different columns down different routes, and the output names remember each route.

Task: write prepared_names(table, number_columns, word_columns).

• table is a dict mapping column names to lists. number_columns and word_columns are lists of column names in it.
• Build a ColumnTransformer with two lines, in this order:
  • ("numbers", StandardScaler(), number_columns)
  • ("words", OneHotEncoder(handle_unknown="ignore"), word_columns)
• Fit it on the table and return get_feature_names_out() as a list of strings.